Vehicle attachment



' Aug. 18, 1942. u s u R 2,293,632

VEHICLE ATTACHMENT Filed Aug. 19, 1940 d 2 AZ l g t: K j a SHAW/Hm URBAN 5140157 &

Patented Aug. 18, 1942 VEHICLE ATTACHMENT Urban sanerplittsburgh, Pm,

fifths to Harry R. Levy,

assignor of two- McKeesport. Pa.

Application August 19, 1940, Serial N0. 353,297

(or. 60-30) V This invention relates to internal combustion 2 Claims.

engines. and more particularly to an attachment to be placed on the exhaust side of the engine.

An object of this invention is to provide a device of this kind which will dilute and cool the exhaust gases of the engine before dispersing them into the atmosphere.

The subject matter of this application is a continuation in part of my application, Serial No. 226,593 which eventuated into Letters Patent To the foregoing objects and others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawing wherein is shown an embodiment of this invention, but it is to be understood that changes, variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

The drawing illustrates a longitudinal cross section of my invention.

Referring to the drawing the numeral III designates generally an exhaust pipe which is adapted to be connected to the exhaust manifold of an internal combustion engine. A cylindrical body I I is adapted to be connected intermediate the ends thereof to the exhaust pipe I0, and the cylindrical member II includes an end wall I2 which is formed with an axial opening II. The opposite end of the cylindrical member I3 is formed with a relatively thick wall I 4 which is provided with a threaded axial opening I5, substantially longer than opening I3, in which an outlet pipe I 8 is adapted to be moun The thick wall I4 is formed with a frustoconical inner surface II which merges at its inner large end with the inner surface of the cylindrical body I I and the outer or reduced end of the frusto-conical surface I! merges with the inner surface of the pipe I6. An air tube I8 is disposed axially of the cylindrical member II and extends through the opening lit in the end wall I2. The outer end of the air pipe I8 is flared as at I9 and at a point inwardly from the wall I3, a damper or valve 20 is disposed in the air passage I8 and is mounted on a vertically disposed shaft 2|. The shaft 2| has a handle 22 at one end thereof, so that the valve or damper 20 may be adjusted to admit the desired amount of air through the air tube I8.

The air tube I8 at its inner end is formed with an enlarged head member generally designated flared portion I! of the air as 23. The enlarged head member 23 includes a frusto-conical section 24 which has its smaller end merging with the inner end of the air pipe l8, and the larger or base end of the section 2| is formed integral with an oppositely disposed frusto-conical section 25. The section 25 is formed on the outer peripheral surface thereof with spirally arranged grooves 28 and the smaller or apex end of the frusto-conical section 25 terminates inwardly from the apex of the frustoconical surface I'I, so as to form an annular opening connecting the chamber formed by the cylindrical body I I with the pipe I8.

The enlarged head member 23 is also formed on the inner surface of the frusto-conical section 28 with a. plurality of spirally arranged blades 28 which are adapted to cause the air to assume a swirling or spiral motion. The exhaust gases passing through the exhaust pipe Ill into the body Ii and through the annular opening at the end of the body II are also caused to assume a swirling or spiral motion as they pass in the pipe II. The spirally arranged grooves 28 are oppositely disposed with relation to the spirally arranged blades 28, so that the gas and air are caused to swirl in opposite directions, in order to thereby effect a thorough mixing of the air and gas in a mixing chamber 21.

In the use and operation of this device the P pe I8 will be directed toward the front of the vehicle on which it is attached, whereby the forward motion of the vehicle will force air to enter the pipe I8 and pass through the device. As the air travels through the device it is caused to swirl by the blades 24. i

The exhaust gases passing through the annular opening and through the grooves 28 are caused to swirl in an opposite direction to the rotation of the air As the oppositely swirling gases and air pass through the mixing chamber 21 and into the pipes I 8,, they ar thoroughly commingled and the exhaust gases are diluted and cooled by the air before passing into the atmosphere.

when the vehicle is at rest, the exhaust gases will create an ejector action on the air, and the gas will be mixed with the air at that time as well as when the vehicle is in motion.

What I claim is:

1. In a device of the character described, an exhaust pipe, a cylindrical casing secured to said pipe, an end wall provided with an axial 'opening therein formed integrally with one end of the casing, a thickened end wall having a threaded axial opening therein formed integrally with the opposite end of the casing, said second named end wall having a irusto-conical inner face, a discharge pipe threaded into the axial opening in the second named end wall, an air tube passing through the axial opening of the first mentioned end wall, and an enlarged head member formed on the inner end of said air pipe, said head member being formed of opposed frustoconical sides with the reduced end of one of said sides secured to said air tube at its inner end and with the other side positioned substantially parallel to and adjacent said irusto-conical face of the thickened end wall, said head member being provided with internal air-swirling vanes and ex-' ternal gas swirling grooves, whereby intima mixture of the gas and air is obtained.

2. In a device of the character described, an exhaust pipe, a cylindrical casin secured to said pipe, an end wall provided with an axial opening therein formed integrally with one end of the casing, a thickened end wall having a thread- 20 ed axial opening therein iormed integrally with the opposite end of the casing, said second named end wall having a frusto conical inner face, a discharge pipe threaded into the axial opening in the second named end wall, an air tube passing through the axial opening of thefirst mentioned end wall, said air tube being provided "at its outer end with a flared mouth, a valve 'member mounted in said'air tube adjacent said mouth, and an enlarged head member formed on the inner end of said pipe, said head member being formed of opposed trusto-conical sides with.

- a reduced end of one of saidsides being secured to said air tube at its inner end and with the other side positioned substantially parallel to and 

